The FuG 227 Flensburg was a German passive radar receiver developed by Siemens AG and introduced into service in Spring 1944. It used wing-mounted dipole antennae and was sensitive to frequencies of 170-220 MHz, subharmonics of the Monica radar's 300 MHz transmissions. It allowed Luftwaffe nightfighters to home in on the Monica tail warning radar fitted to RAF bombers.
On the morning of 1944-07-13, a Junkers Ju 88G-1 night fighter of 7.Staffel/NJG 2 equipped with Flensburg mistakenly landed at RAF Woodbridge. After examining the Flensburg, the RAF ordered Monica to be withdrawn from all RAF Bomber Command aircraft.
Subsequently, further variants of Flensburg (Flensburg II to Flensburg VI) were developed for detecting Allied radar jammers. Only Flensburg II and III were used operationally.
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